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/*
 * Copyright 2016 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.javascript.jscomp.testing;

import static com.google.common.truth.Truth.assertAbout;
import static org.junit.Assert.assertEquals;

import com.google.common.truth.FailureMetadata;
import com.google.common.truth.Subject;
import com.google.javascript.jscomp.DiagnosticType;
import com.google.javascript.jscomp.JSError;
import javax.annotation.CheckReturnValue;

/**
 * A Truth Subject for the JSError class. Usage:
 *  *   import static com.google.javascript.jscomp.testing.JSErrorSubject.assertNode;
 *   ...
 *   assertError(error).hasType(TypeValidator.TYPE_MISMATCH);
 * 
 * TODO(tbreisacher): Add assertions on the message text, line number, etc.
 */
public final class JSErrorSubject extends Subject {
  @CheckReturnValue
  public static JSErrorSubject assertError(JSError error) {
    return assertAbout(JSErrorSubject::new).that(error);
  }

  public JSErrorSubject(FailureMetadata failureMetadata, JSError error) {
    super(failureMetadata, error);
  }

  public void hasType(DiagnosticType type) {
    String message = "Expected an error of type " + type + " but got: " + actual();
    assertEquals(message, type, actual().getType());
  }

  public void hasMessage(String msg) {
    assertEquals(
        "Expected an error with message:\n" + msg + " but got:\n" + actual(),
        msg,
        actual().description);
  }
}